Key Takeaways
- • Investopedia's feature profiles nine notable hedge fund failures, spanning fraud, insider trading, leverage blowups, and style-driven collapses, led by the Bernie Madoff Ponzi scheme with an estimated fraud of around $65 billion.
- • Long-Term Capital Management (LTCM), led by Nobel laureates, nearly destabilized the global financial system in 1998 before a Wall Street bank consortium and Federal Reserve-assisted creditor takeover prevented contagion.
- • SAC Capital, run by Steven Cohen with $50 billion in peak AUM, agreed to a $1.8 billion civil settlement and to stop managing outside money after insider trading convictions of eight former employees.
- • Amaranth Advisors lost more than $6.6 billion on derivative bets after growing to over $9 billion in assets by 2006, illustrating concentration and leverage risk.
- • Investopedia notes that global hedge fund assets continue to grow, nearing $5 trillion, despite these failures, which it frames as a reminder of opacity and operational risk in hedge fund investing.
Summary
Investopedia, in an article by John Edwards updated August 19, 2026, catalogs nine of the largest hedge fund failures, grouping them by cause. The most severe case cited is Bernie Madoff's Ponzi scheme, which Investopedia estimates at around $65 billion in fraud. Madoff pleaded guilty to multiple federal crimes, was sentenced to 150 years in prison, and was ordered to pay restitution of $170 billion. The article notes that Harry Markopolos repeatedly warned the SEC, which dismissed the allegations after minimal investigation.
Insider trading and enforcement cases form a second group. SAC Capital, led by Steven Cohen with $50 billion in peak AUM, faced SEC raids in 2010 and charges that led to eight former employee convictions. The firm agreed to pay a $1.8 billion fine and to stop managing outside money. Galleon Group, with over $7 billion in AUM, closed in 2009 after founder Raj Rajaratnam was convicted on 14 counts and sentenced to 11 years in prison. Pequot Capital, founded in 1998 by Art Samberg, grew to more than $15 billion but was charged by the SEC in 2010, with Pequot and Samberg fined $28 million.
Leverage and strategy failures make up the third group. Long-Term Capital Management attracted more than $1 billion from 1994 to 1998 with an arbitrage strategy and was rescued in September 1998 with Federal Reserve assistance, as creditors took over the fund to prevent systemic contagion. Amaranth Advisors, launched in 2000 by Nicholas Maounis, reached over $9 billion by 2006 before derivative bets produced losses exceeding $6.6 billion. Tiger Management, led by Julian Robertson, fell from more than $23 billion in AUM in 2000 to about $6 billion as its short positions in overpriced technology stocks lost during the tech rally. Aman Capital, set up in 2003 by UBS derivatives traders, suffered losses of hundreds of millions in credit derivatives, dropped to $242 million by March 2005, and closed in June 2005. Marin Capital, which attracted $1.7 billion, suffered a large loss tied to a bet on General Motors using credit and convertible arbitrage.
The article concludes that despite these failures, hedge fund assets continue to grow toward $5 trillion, and that opacity and operational risk remain key considerations for investors conducting due diligence.
Insider trading and enforcement cases form a second group. SAC Capital, led by Steven Cohen with $50 billion in peak AUM, faced SEC raids in 2010 and charges that led to eight former employee convictions. The firm agreed to pay a $1.8 billion fine and to stop managing outside money. Galleon Group, with over $7 billion in AUM, closed in 2009 after founder Raj Rajaratnam was convicted on 14 counts and sentenced to 11 years in prison. Pequot Capital, founded in 1998 by Art Samberg, grew to more than $15 billion but was charged by the SEC in 2010, with Pequot and Samberg fined $28 million.
Leverage and strategy failures make up the third group. Long-Term Capital Management attracted more than $1 billion from 1994 to 1998 with an arbitrage strategy and was rescued in September 1998 with Federal Reserve assistance, as creditors took over the fund to prevent systemic contagion. Amaranth Advisors, launched in 2000 by Nicholas Maounis, reached over $9 billion by 2006 before derivative bets produced losses exceeding $6.6 billion. Tiger Management, led by Julian Robertson, fell from more than $23 billion in AUM in 2000 to about $6 billion as its short positions in overpriced technology stocks lost during the tech rally. Aman Capital, set up in 2003 by UBS derivatives traders, suffered losses of hundreds of millions in credit derivatives, dropped to $242 million by March 2005, and closed in June 2005. Marin Capital, which attracted $1.7 billion, suffered a large loss tied to a bet on General Motors using credit and convertible arbitrage.
The article concludes that despite these failures, hedge fund assets continue to grow toward $5 trillion, and that opacity and operational risk remain key considerations for investors conducting due diligence.
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